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<p>[QUOTE=&quot;dannic113, post: 1413703, member: 35203&quot;]Tone depends on three things 1)what agents are at work? sunlight? heat? moisture? storage? 2)what reactive materials are the coin(s) in contact with? cotton bags? plastic? wood? sulfurs? and 3)length of time how long have one and two be getting it on? Any and all changes in those three and you have different colors, strengths, patterns the list goes on. As for stopping it I suppose a true vacuum would stop it as it would no longer have air present to oxidize the coin. Other than that GDJMSP is right in saying only control no stopping it. He is also right about other items toning. Take some silver jewelry and put it up inside and up against a cotton duck bag from the mint and leave it there after a while it will start to turn pinkish red I believe. I even have some old plated silver flatware that went rainbow and have even seen stainless steel flatware take on coloring if not outright toning.[/QUOTE]</p><p><br /></p>

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